AONIJIE Kids Ultra Vest 5L Hydration Backpack with 2pcs 250ml Water Bags Pack Bag Children Backpack for 6 to 12 Years - B09923Z1PZ Lightweight, breathable, bonding Small body, and large capacity, High strength Nylon fabric as the base Mesh breathable fabric; Reflective silk screen printing Backpack sizes:26*31cm; Recommended Chest Circumference: 55-80 cm Package : 5L backpack with 2*250ml..